Site-Site With Dynamic Ips.

Hello all,

I have three sites linked to an Astaro in the following configuration:

(dynamic)ETH1 Site A - (VPN) - Site B (Static)
(dynamic)ETH2 Site A - (VPN) - Site C (Static)
(dynamic)ETH3 Site A - (VPN) - Site D (Static)

However every time the power goes out the ips change resulting in reconfiguring the VPNs. I've purchased a DYNDNS account to set those interfaces to host names (Done) then set up DynDNS in the astaro (Changed Network services - > DNS -> DynDNS)

Is that all I have to do?

Thanks for the input,
120Newb